Diet soda is bad for everybody, regardless of your age. It contains less calories, but the artificial sweeteners they use cause cancer. And the phenylalinine in diet soda slows your body's metabolism to a crawl, so you'll actually gain weight in the long run.
Yes. It's worse for you than regular coke. It has aspartame as the sweetener. Did you know that they use the same material that goes on the outside of the space shuttles to transport aspartame in, and they have to change it out like every 3 weeks because the aspartame eats through it. No what do you think it does to your stomach? Coke is still bad for you but not nearly as bad a diet coke.